package com.addplus.townmall.server.api.utils;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.common.BitMatrix;

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.util.Base64;
import java.util.Hashtable;

/**
 * 类名: QRCodeUtils
 *
 * @author zhangjiehang
 * @version V1.0
 * @date 2018/9/19 下午3:13
 * @description 类描述: 生成二维码base64字符工具类
 */
public class QRCodeUtils {

    public static String generalQRCode(String url) {
        Hashtable hints = new Hashtable();
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
        String binary = null;
        try {
            BitMatrix bitMatrix = new MultiFormatWriter().encode(url, BarcodeFormat.QR_CODE, 200, 200, hints);
            ByteArrayOutputStream out = new ByteArrayOutputStream();
            BufferedImage image = toBufferedImage(bitMatrix);
            ImageIO.write(image, "png", out);
            byte[] bytes = out.toByteArray();
            binary = Base64.getEncoder().encodeToString(bytes).trim();
        } catch (Exception e) {
            e.printStackTrace();
        }

        return binary;
    }

    // 其他调用方法
    public static BufferedImage toBufferedImage(BitMatrix matrix) {
        int width = matrix.getWidth();
        int height = matrix.getHeight();
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        for (int x = 0; x < width; x++) {
            for (int y = 0; y < height; y++) {
                image.setRGB(x, y, matrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);
            }
        }
        return image;
    }

}
